هذا بلاغ فقدان.

A careful MSA pronunciation is:

hādhā balāghu fuqdānin

In normal unvowelled reading or pause, you will often hear it more simply as:

hādhā balāgh fuqdān

Very roughly in English-style syllables:

HAA-dhaa ba-LAAGH fuq-DAAN

• هذا = hādhā
• بلاغ = balāgh
• فقدان = fuqdān

Because Arabic often uses a nominal sentence in the present tense with no written or spoken copula.

So:

هذا بلاغ فقدان
literally looks like this report-of-loss,
but it means This is a loss report / missing-item report.

This is very normal in Arabic. Compare:

• هذا كتاب = This is a book
• هذا بلاغ فقدان = This is a loss report

If you wanted a past tense, then Arabic would use a verb such as كان.

Because بلاغ is a masculine singular noun, and هذا is the masculine singular demonstrative meaning this.

• هذا = masculine singular this
• هذه = feminine singular this

So Arabic says:

• هذا كتاب = This is a book
• هذا بلاغ = This is a report

If the main noun were feminine, you would use هذه instead.

Yes. بلاغ فقدان is an iḍāfa construction, often called a construct phrase.

It is made of:

• بلاغ = report / notification
• فقدان = loss / disappearance / being missing

Together, they mean something like:

• report of loss
• loss report
• missing-item report

So the whole sentence is:

• هذا = this
• بلاغ فقدان = a report of loss

That makes the full meaning: This is a loss report.

Here بلاغ means something like:

• report
• notification
• official notice

It is often used in formal or administrative contexts, such as police, government, or paperwork.

So in this sentence, بلاغ is not just any casual message. It sounds more like an official report/notice.

Yes. فقدان is a verbal noun related to the verb فَقَدَ / يَفْقِدُ, which has meanings connected to:

• to lose
• to be without
• to miss
• to find missing

So فقدان can mean:

• loss
• absence
• disappearance
• being missing

In a form or official label, بلاغ فقدان usually refers to reporting that something has been lost or is missing.

Because بلاغ is the first word in an iḍāfa.

In an iḍāfa:

• the first noun does not take الـ
• the first noun also does not take tanwīn

So not:

• البلاغ فقدان
• بلاغٌ فقدان

But:

• بلاغُ فقدانٍ

That is the normal grammar of the construct phrase.

In fully vowelled MSA, it would be:

هٰذا بَلاغُ فُقْدانٍ

Here is why:

• هذا is a demonstrative pronoun
• بلاغُ is the predicate, so it is nominative
• فقدانٍ is the second term of the iḍāfa, so it is genitive

In ordinary Arabic writing, these short vowels are usually not written, so learners often do not see them.

It can be understood as both.

Grammatically, it is a complete sentence:

• هذا = subject-like element
• بلاغ فقدان = predicate

So it works as This is a loss report.

But in real life, Arabic also uses short expressions like this as titles, headings, or form labels. So on a document, it could simply function like:

• Loss Report
• Missing Item Report

Yes, that is also possible, but it is slightly different in style.

• بلاغ فقدان is a compact iḍāfa phrase: report of loss
• بلاغ عن فقدان ... uses the preposition عن and means a report about the loss of ...

For example:

• بلاغ عن فقدان جواز السفر = a report about the loss of the passport

The version in your sentence is shorter and more label-like.